但由于传统的压电传感器存在着空气与普通的压电材料之间严重不耦合现象，所以压电传感器并不是高效率的超声源。
The traditional PZT, however, is not the ultrasonic source with high efficiency because of the serious non-coupling phenomena between air and ordinary piezoelectric material.
它既是混凝土结构健康监测的智能元件，又具有普通骨料的功能，很好地解决了压电传感器与主体结构相结合时出现的各种实际问题。
The new smart sensor has the functions of both smart elements and the normal aggregate in concrete materials and can be used to solve problems caused by the combination of two materials.
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